x86, mm: use limit_pfn for end pfn
instead of shifting end to get that. Signed-off-by: NYinghai Lu <yinghai@kernel.org> Link: http://lkml.kernel.org/r/1353123563-3103-39-git-send-email-yinghai@kernel.orgSigned-off-by: NH. Peter Anvin <hpa@linux.intel.com>
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